1995 MERCURY MARQUIS STALLED ON FREEWAY, CAN REV ENGINE BUT WON'T GO, AND NOW IT WON'T START

I WAS GOING DOWN THE FREEWAY ABOUT 60 MILES AN HOUR WHEN ALL OF A SUDDEN THE CAR WOULD NOT GO OR ACCELERATE AND I COASTED TO THE SIDE OF THE ROAD. I PUT IT IN PARK AND COULD STILL REV THE ENGINE BUT WHEN I PUT IT IN DRIVE IT WOULD NOT MOVE. I SHUT THE ENGINE OFF BUT THEN IT WOULD NOT START. IT JUST MAKES A CLICKING NOISE I TRIED JUMPING THE CAR BUT IT MADE NO DIFFERENCE. I CHECKED THE OIL AND NOTHING WAS ON THE STICK BUT THERE WAS NO LEAKS UNDER THE CAR.I AM UNEMPLOYED AND BROKE RIGHT NOW BUT I WOULD APPRECIATE ANY IDEAS. THANK YOU, DON